How to Clean Bathroom Grout

The most effective way how to clean bathroom grout is to apply a paste of baking soda and water (or baking soda and hydrogen peroxide for tougher stains), scrub with a stiff brush, and rinse. For severe mold or discoloration, a diluted bleach solution or commercial grout cleaner like Zep or Grout-Eez works faster with less scrubbing.

Grout is porous, which means it soaks up soap scum, mildew, and grime over time – especially in wet shower environments. Regular cleaning keeps it manageable; if it’s been neglected, you may need a stronger approach first.

Cleaning Methods by Stain Severity

Step-by-Step: Basic Grout Cleaning

Step 1 – Wet the grout lines with warm water.

Step 2 – Make a paste: Mix baking soda with just enough water to form a thick paste. For more power, use hydrogen peroxide instead of water.

Step 3 – Apply the paste: Spread it generously along the grout lines. Let it sit for 10-15 minutes.

Step 4 – Scrub: Use a stiff-bristled grout brush, an old toothbrush, or a drill brush attachment for large areas. Scrub in small circular motions along each grout line.

Step 5 – Spray with white vinegar (optional): Spraying vinegar over the baking soda creates a fizzing reaction that helps loosen buildup. Let it bubble for a minute, then scrub again.

Step 6 – Rinse thoroughly with warm water. Wipe dry to prevent water spots.

For Mold and Black Grout

Mix 1 part bleach with 4 parts water in a spray bottle. Apply to the grout, let sit for 10 minutes, then scrub and rinse. Open windows and wear gloves. Never mix bleach with vinegar or any other cleaner – the combination produces toxic chlorine gas.

For shower grout specifically, a gel bleach pen (like Clorox Bleach Pen) is very effective because the gel stays in contact with the grout longer than a spray without dripping everywhere.

Tools That Make It Easier

• Drill brush attachment – fits a standard drill, scrubs large areas in seconds
• Grout brush (narrow stiff bristles) – more precise than a toothbrush
• Steam cleaner – the steam penetrates pores and loosens grime without chemicals
• Oxygen bleach (OxiClean) – safer than chlorine bleach, effective for colored grout

How to Keep Grout Clean Longer

• Seal grout every 1-2 years with a grout sealer – it fills the pores and makes cleaning far easier
• Spray shower grout with a daily shower spray (Method or Clean Shower) after each use
• Run the bathroom fan during and after showers to reduce moisture that feeds mildew
• Wipe down tile walls with a squeegee after showering

Final Thoughts

Baking soda and hydrogen peroxide handle most bathroom grout cleaning without harsh chemicals. For mold or heavily stained grout, diluted bleach works fastest. The real key to easy maintenance is sealing your grout – a sealed surface resists staining and cleans up with a quick wipe instead of heavy scrubbing.